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Schedule of Investments (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2015
Collateral Amount On Open Futures Contracts | 21,607,192 usl_CollateralAmountOnOpenFuturesContracts
United States | US Treasury Securities | Cash Equivalents | U.S. Treasury Bills 0.05%, 7/9/2015 |
Interest rate | 0.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities1Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 7/9/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.08%, 7/23/2015 |
Interest rate | 0.08%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities2Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 7/23/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.06%, 7/30/2015 |
Interest rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities3Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 7/30/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.06%, 8/6/2015 |
Interest rate | 0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities4Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 8/6/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.07%, 8/13/2015 |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities5Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 8/13/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.07%, 8/20/2015 |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities6Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 8/20/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.07%, 8/27/2015 |
Interest rate | 0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities7Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 8/27/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.08%, 9/3/2015 |
Interest rate | 0.08%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities8Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 9/3/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.10%, 9/10/2015 |
Interest rate | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities9Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 9/10/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.12%, 9/17/2015 |
Expiration date | 9/17/2015
United States | US Treasury Securities | Cash Equivalents | U.S.Treasury Bills 0.11%, 9/24/2015 |
Interest rate | 0.11%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DerivativeInstrumentRiskAxis = usl_UsTreasuryBillsSecurities11Member / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember
Expiration date | 9/24/20
United States | U.S. Treasury Bill 0.10%, 6/25/2015 | US Treasury Securities | Cash Equivalents |
Interest rate | 0.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentGeographicRegionAxis = country_US / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = usl_UsTreasuryBillSecurities1Member
Expiration date | 6/25/2015

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